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Title: ac susceptibility in YBa[sub 2](Cu[sub 1[minus][ital x]]Fe[sub [ital x]])[sub 3]O[sub 7[minus][delta]]: Evidence for two-step irreversibility-line crossover

Abstract

The ac susceptibilities of YBa[sub 2](Cu[sub 1[minus][ital x]]Fe[sub [ital x]])[sub 3]O[sub 7[minus][delta]] polycrystals for 0[le][ital x][lt]0.05 have been measured as a function of temperature and magnetic-field strength. Two different types of behavior of the irreversibility line, [ital T][sub [ital m]]([ital H]), obeying the law 1[minus][ital T][sub [ital m]]/[ital T][sub [ital c]][similar to][ital H][sup [ital q]] have been found. One corresponds to pure Y-Ba-Cu-O ([ital x]=0) and shows the commonly observed change of the power exponent [ital q] from 2/3 to 1 with increasing field. For the iron-doped samples an additional unusual crossover from [ital q]=1 to [ital q]=4/3 is observed practically within the same field and temperature interval as for the undoped one. The obtained results are described via the critical-state model taking into account the modification of the Josephson medium for the iron-doped case. In contrast to the silver-doped case [S.L. Shinde [ital et] [ital al]., Phys. Rev. B 41, 8838 (1990)], the pinning-force densities turn out to be smaller for iron-doped Y-Ba-Cu-O as compared to the undoped sample, probably due to iron-induced creation of a weak-link network inside grains.

Authors:
 [1]; ;  [2];  [1];  [3]
  1. Service de Physique des Solides, Universite Libre de Bruxelles, CP 233, boulevard du Triomphe, B-1050 Brussels (Belgium)
  2. S.U.P.RS., B5, Institute of Physics, University of Liege, Sart Tilman, B-4000 Liege (Belgium)
  3. S.U.P.RS., B5, Institute of Physics, University of Liege, Sart Tilman, B-4000 Liege (Belgium) Service de Physique des Solides, Universite Libre de Bruxelles, CP 233, boulevard du Triomphe, B-1050 Brussels (Belgium)
Publication Date:
OSTI Identifier:
5529012
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter; (United States)
Additional Journal Information:
Journal Volume: 48:1; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM OXIDES; MAGNETIC SUSCEPTIBILITY; COPPER OXIDES; HIGH-TC SUPERCONDUCTORS; YTTRIUM OXIDES; GRAIN BOUNDARIES; IRON ADDITIONS; SUBSTOICHIOMETRY; TEMPERATURE DEPENDENCE; ALKALINE EARTH METAL COMPOUNDS; ALLOYS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; IRON ALLOYS; MAGNETIC PROPERTIES; MICROSTRUCTURE; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Mehbod, M, Sergeenkov, S, Ausloos, M, Schroeder, J, and Dang, A. ac susceptibility in YBa[sub 2](Cu[sub 1[minus][ital x]]Fe[sub [ital x]])[sub 3]O[sub 7[minus][delta]]: Evidence for two-step irreversibility-line crossover. United States: N. p., 1993. Web. doi:10.1103/PhysRevB.48.483.
Mehbod, M, Sergeenkov, S, Ausloos, M, Schroeder, J, & Dang, A. ac susceptibility in YBa[sub 2](Cu[sub 1[minus][ital x]]Fe[sub [ital x]])[sub 3]O[sub 7[minus][delta]]: Evidence for two-step irreversibility-line crossover. United States. doi:10.1103/PhysRevB.48.483.
Mehbod, M, Sergeenkov, S, Ausloos, M, Schroeder, J, and Dang, A. Thu . "ac susceptibility in YBa[sub 2](Cu[sub 1[minus][ital x]]Fe[sub [ital x]])[sub 3]O[sub 7[minus][delta]]: Evidence for two-step irreversibility-line crossover". United States. doi:10.1103/PhysRevB.48.483.
@article{osti_5529012,
title = {ac susceptibility in YBa[sub 2](Cu[sub 1[minus][ital x]]Fe[sub [ital x]])[sub 3]O[sub 7[minus][delta]]: Evidence for two-step irreversibility-line crossover},
author = {Mehbod, M and Sergeenkov, S and Ausloos, M and Schroeder, J and Dang, A},
abstractNote = {The ac susceptibilities of YBa[sub 2](Cu[sub 1[minus][ital x]]Fe[sub [ital x]])[sub 3]O[sub 7[minus][delta]] polycrystals for 0[le][ital x][lt]0.05 have been measured as a function of temperature and magnetic-field strength. Two different types of behavior of the irreversibility line, [ital T][sub [ital m]]([ital H]), obeying the law 1[minus][ital T][sub [ital m]]/[ital T][sub [ital c]][similar to][ital H][sup [ital q]] have been found. One corresponds to pure Y-Ba-Cu-O ([ital x]=0) and shows the commonly observed change of the power exponent [ital q] from 2/3 to 1 with increasing field. For the iron-doped samples an additional unusual crossover from [ital q]=1 to [ital q]=4/3 is observed practically within the same field and temperature interval as for the undoped one. The obtained results are described via the critical-state model taking into account the modification of the Josephson medium for the iron-doped case. In contrast to the silver-doped case [S.L. Shinde [ital et] [ital al]., Phys. Rev. B 41, 8838 (1990)], the pinning-force densities turn out to be smaller for iron-doped Y-Ba-Cu-O as compared to the undoped sample, probably due to iron-induced creation of a weak-link network inside grains.},
doi = {10.1103/PhysRevB.48.483},
journal = {Physical Review, B: Condensed Matter; (United States)},
issn = {0163-1829},
number = ,
volume = 48:1,
place = {United States},
year = {1993},
month = {7}
}